中华口腔医学研究杂志(电子版)
中華口腔醫學研究雜誌(電子版)
중화구강의학연구잡지(전자판)
CHINESE JOURNAL OF STOMATOLOGICAL RESEARCH(ELECTRONIC VERSION)
2009年
4期
391-397
,共7页
童新文%程辉%李强%章少萍%李秀容
童新文%程輝%李彊%章少萍%李秀容
동신문%정휘%리강%장소평%리수용
反复熔铸%镍铬烤瓷合金%电化学腐蚀
反複鎔鑄%鎳鉻烤瓷閤金%電化學腐蝕
반복용주%얼락고자합금%전화학부식
Recasting%Ni-Cr casting alloy%Electrochemical corrosion
目的 探讨反复熔铸对镍铬烤瓷合金在人工唾液中电化学腐蚀行为的影响.方法 试样由镍铬烤瓷合金分别经过1、2、3、4及5次熔铸(即Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ代试样)后,再经铜导线焊接、聚甲基丙烯酸甲酯包埋、测试面氧化铝砂纸磨光和布轮抛光而成.试样浸泡于人工唾液中[温度为(37.0 ± 1.0)℃,pH为7.4 ± 0.1]24 h后,参考ISO 10271(2001)标准,采用动电位极化曲线法测试其抗腐蚀性能,并用扫描电镜观察合金腐蚀前后表面形貌的变化.结果 各代试样间Ecorr、Ep、Rp、Icorr等电化学参数间差异无统计学意义(P > 0.05);两两比较表明,Ⅱ代Ep大于Ⅰ代(P=0.023),余差异无统计学意义;扫描电镜观察,极化扫描后试样表面产生腐蚀,但各代之间没有明显区别.结论 镍铬烤瓷合金经反复熔铸5次后电化学腐蚀没有明显改变.
目的 探討反複鎔鑄對鎳鉻烤瓷閤金在人工唾液中電化學腐蝕行為的影響.方法 試樣由鎳鉻烤瓷閤金分彆經過1、2、3、4及5次鎔鑄(即Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ代試樣)後,再經銅導線銲接、聚甲基丙烯痠甲酯包埋、測試麵氧化鋁砂紙磨光和佈輪拋光而成.試樣浸泡于人工唾液中[溫度為(37.0 ± 1.0)℃,pH為7.4 ± 0.1]24 h後,參攷ISO 10271(2001)標準,採用動電位極化麯線法測試其抗腐蝕性能,併用掃描電鏡觀察閤金腐蝕前後錶麵形貌的變化.結果 各代試樣間Ecorr、Ep、Rp、Icorr等電化學參數間差異無統計學意義(P > 0.05);兩兩比較錶明,Ⅱ代Ep大于Ⅰ代(P=0.023),餘差異無統計學意義;掃描電鏡觀察,極化掃描後試樣錶麵產生腐蝕,但各代之間沒有明顯區彆.結論 鎳鉻烤瓷閤金經反複鎔鑄5次後電化學腐蝕沒有明顯改變.
목적 탐토반복용주대얼락고자합금재인공타액중전화학부식행위적영향.방법 시양유얼락고자합금분별경과1、2、3、4급5차용주(즉Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ대시양)후,재경동도선한접、취갑기병희산갑지포매、측시면양화려사지마광화포륜포광이성.시양침포우인공타액중[온도위(37.0 ± 1.0)℃,pH위7.4 ± 0.1]24 h후,삼고ISO 10271(2001)표준,채용동전위겁화곡선법측시기항부식성능,병용소묘전경관찰합금부식전후표면형모적변화.결과 각대시양간Ecorr、Ep、Rp、Icorr등전화학삼수간차이무통계학의의(P > 0.05);량량비교표명,Ⅱ대Ep대우Ⅰ대(P=0.023),여차이무통계학의의;소묘전경관찰,겁화소묘후시양표면산생부식,단각대지간몰유명현구별.결론 얼락고자합금경반복용주5차후전화학부식몰유명현개변.
Objective To investigate the influence of recasting on the electrochemical corrosion properties of the Ni-Cr alloy for porcelain-fused-to-metal restoration in artificial saliva. Methods Five groups of cylindrical specimens [(Φ=(4.02 ± 0.04)mm,l=(8.00 ± 0.07)mm] were made by casting Ni-Cr alloys for porcelain-fused-to-metal restoration successively for 1, 2, 3, 4 and 5 times (GenerationⅠ-Ⅴ), respectively. One undersurface of the specimen was polished using standard metallurgical procedures with wet aluminum oxide papers, the other undersurface was welded with copper wires. The specimens were embeded with polymethyl methacrylate with the testing surfaces exposed. The electrochemical corrosion behavior of the recasted Ni-Cr alloys was studied by potentiodynamic polarization in artificial saliva [t=(37.0 ± 1.0)℃,pH=7.4 ± 0.1] according to ISO 10271(2001) to measure the corrosion potential (Ecorr), breakdown potential(Ep), polarization resistance(Rp) and self-corrosion current density(Icorr). The surface characteristics of the specimens were observed after test by scanning electron microscope. The experimental data were analysed by One-way ANOVA and Dunnett-t test. Results It was found that varieties of five generations of specimen in Ecorr, Ep, Rp, Icorr have no statistical significant differences (P > 0.05). Dunnett-t test demonstrated that there were no differences except that Ep of Ⅱ was greater thanⅠ(P=0.23). Pitting corrosion on the alloy surface showed no differences among the five groups. Conclusion Ni-Cr casting alloy for porcelain-fused-to-metal restoration can be reused after five times remelting in term of electrochemical corrosion.